Allen-Bradley 1783-US8T Stratix 2000 Unmanaged Switch

The Allen-Bradley 1783-US8T, also cataloged as the 1783-US8T Unmanaged Switch, operates as a dedicated hardware component for 10/100 Mbps Ethernet packet distribution within Stratix 2000 platforms. Configured with 8 independent copper ports, the device executes raw layer-2 packet forwarding without the need for active address management or CPU processing intervention.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks Performance

The physical layer structure supports deterministic distribution of EtherNet/IP and industrial automation frames by utilizing hardware-based broadcast storm protection. When enabled via the integrated DIP switch, internal circuitry caps broad-scale multicast saturation thresholds to maintain predictable backplane bus communication velocity across adjacent PLC modules. The internal buffer architecture scales safely against localized I/O density scaling spikes, ensuring that standard 10/100 Mbps transmission streams do not introduce variable packet jitter into real-time producer-consumer network loops.

Frequently Asked Questions

Q: How is the maximum inrush current threshold of 1.31 A managed during simultaneous network power-up cycles?

A: The internal power supply circuit features capacitive components that generate a brief 1.31 A surge upon initial voltage application. Upstream 24 VDC power distribution must be sized to tolerate this transient without dropping below the minimum 12 VDC operational threshold.

Q: Does this unmanaged module support custom firmware flash compatibility updates?

A: No. As a completely hardware-configured unmanaged switch, the device lacks an onboard processor or volatile memory allocations reserved for firmware modifications. All logic execution is hardwired within the internal switching fabric.

Field Installation Guidelines

• DIN-Rail Mounting Stability: Snap the rear integrated mounting clip directly onto a standard 35 mm symmetric DIN rail. Ensure the top hook is seated completely before snapping the bottom tension lock into place to prevent physical displacement from operational vibration.
• Power Conductor Termination: Secure incoming AC or DC power lines into the removable terminal plug. Ensure positive, negative, and frame ground connections match the printed terminal markings to avoid reversing electrical polarity.
• Shielding and Grounding Standards: Ground the DIN rail itself to the main protective earth enclosure busbar. Use shielded twisted-pair (STP) Cat5e or Cat6 cabling to mitigate high-frequency electromagnetic interference from surrounding variable frequency drives.
• DIP Switch Activation: Prior to powering the unit, set the integrated DIP switch to the active position if broadcast storm mitigation is required for the local machine-level network cell.